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Ca2+-dependent redox modulation of SERCA 2b by ERp57
1Dept. of Physiology, MSC 7756, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900, USA.
The Journal of Cell Biology
|December 31, 2003
Summary
The endoplasmic reticulum oxidoreductase ERp57 regulates calcium (Ca2+) oscillations by interacting with SERCA2b. This interaction dynamically controls ER Ca2+ homeostasis through redox modulation.
Area of Science:
- Cell Biology
- Biochemistry
- Physiology
Background:
- Calreticulin (CRT) inhibits Ca2+ oscillations by binding to SERCA 2b.
- CRT also interacts with ER oxidoreductase ERp57 during glycoprotein folding.
Purpose of the Study:
- To investigate the role of ERp57 in regulating Ca2+ oscillations mediated by SERCA 2b.
- To elucidate the interaction between ERp57 and SERCA 2b.
Main Methods:
- Overexpression of ERp57 and SERCA 2b mutants.
- In vitro binding assays.
- Ca2+ oscillation frequency measurements.
Main Results:
- ERp57 overexpression reduced SERCA 2b-enhanced Ca2+ oscillation frequency.
- SERCA 2b mutants lacking specific cysteines increased Ca2+ oscillation frequency.
- ERp57 showed a Ca2+-dependent interaction with SERCA 2b loop 4.
Conclusions:
- ERp57 modulates SERCA 2b redox state in a Ca2+-dependent manner.
- This interaction provides dynamic control of ER Ca2+ homeostasis.